How many constitutional isomers that are trifluoroethanes exist?
a. 3
b. 2
c. 4
d. 8
e. 5
b
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______________ is the point in Earth's orbit where Earth is closest to the sun
a. Aphelion b. Perihelion c. Precession d. The winter solstice e. a and d
What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. C) Although dark matter emits no visible light, we have detected its radio emissions. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.
Based on current evidence, a supercluster is most likely to have formed in regions of space where
A) the density of dark matter was slightly higher than average when the universe was very young. B) there was an excess concentration of hydrogen gas when the universe was very young. C) supermassive black holes were present in the very early universe. D) the acceleration of the expansion was proceeding faster than elsewhere.
__________is a unit of distance equal to the distance light travels in 1 year
A) The astronomical year B) The light-year C) A light parsec D) A light meter